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- Subject: Re: Native Complex numbers for LuaJIT-2 [was Re: Benchmark shootout shows LuaJIT 2.0]
- From: Leo Razoumov <slonik.az@...>
- Date: Mon, 2 Nov 2009 19:49:36 -0500
On 2009-11-02, Sam Roberts <email@example.com> wrote:
> What do people use complex numbers for?
> I'm baffled, me and two guys sitting near me, all with engineering
> degrees, did lots of pen and paper
> work with complex numbers in university, but I don't recall ever
> seeing an algorithm that would benefit
> from being coded, and I've never, in my 15+ years since graduation,
> seen any code that uses complex
Pretty much entire signal processing, radio communications. Complex
numbers are everywhere. Your cell-phone, WiFi, DSL modems, etc.
Everywhere you have amplitude and phase, you work with complex numbers
(cos and sin bases are not as convenient :-)
Of course, in embedded systems the implementation is cycle/memory
optimized and normally breaks complex-number operations into separate
real and imaginary parts. But for the simulations (especially of
non-bit exact floating point variety) complex data type is God sent.